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Fair Value of Financial Instruments - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Thousands | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 1,760,030 | $ 1,754,039 | [1]
Level 3 |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | 1,716,054 | 1,632,922 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 1,471,816 | $ 1,292,635 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Minimum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.065 | 0.055 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Maximum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.340 | 0.247 |
Level 3 | Senior secured first lien debt | Discounted Cash Flow | Weighted Average | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.147 | 0.099 |
Level 3 | Senior secured first lien debt | Broker Quotes | Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 79,035 | $ 183,768 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | 3,552 | 27,557 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | 20,050 | $ 6,327 |
Measurement input |  | 2.25 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | $ per kW |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 4,527 |  |
Measurement input | $ / shares | 131.85 |  |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Minimum | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 2.75 | 3.50 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Minimum | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.25 |  |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 4.25 | 6.00 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Maximum | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 1.70 |  |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Weighted Average | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 4.09 | 4.98 |
Level 3 | Senior secured first lien debt | Market Comparable Approach | Weighted Average | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 1.19 |  |
Level 3 | Senior secured first lien debt | Other Valuation Technique |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 532 | $ 16,702 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 38,769 | $ 24,408 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Minimum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.143 | 0.085 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Maximum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.215 | 0.186 |
Level 3 | Senior secured second lien debt | Discounted Cash Flow | Weighted Average | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.172 | 0.127 |
Level 3 | Senior secured second lien debt | Broker Quotes | Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value |  | $ 14,175 |
Level 3 | Collateralized securities and structured products - equity | Discounted Cash Flow | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 1,179 | $ 2,998 |
Measurement input | 0.210 | 0.160 |
Level 3 | Unsecured debt | Discounted Cash Flow | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 7,327 | $ 26,616 |
Level 3 | Unsecured debt | Discounted Cash Flow | Minimum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.177 | 0.127 |
Level 3 | Unsecured debt | Discounted Cash Flow | Maximum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input |  | 0.162 |
Level 3 | Unsecured debt | Discounted Cash Flow | Weighted Average | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input |  | 0.136 |
Level 3 | Unsecured debt | Market Comparable Approach | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 15,316 |  |
Level 3 | Unsecured debt | Market Comparable Approach | Minimum | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 9.25 |  |
Level 3 | Equity | Discounted Cash Flow | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 2,238 |  |
Level 3 | Equity | Discounted Cash Flow | Minimum | Discount Rates |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 16.8 |  |
Level 3 | Equity | Broker Quotes | Broker Quotes |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 1,234 |  |
Level 3 | Equity | Market Comparable Approach | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | 33,441 | $ 17,596 |
Level 3 | Equity | Market Comparable Approach | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | 13,038 | 4,032 |
Level 3 | Equity | Market Comparable Approach | $ per kW |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 23,995 | $ 15,127 |
Measurement input | $ / shares | 412.5 | 325 |
Level 3 | Equity | Market Comparable Approach | Minimum | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 2.75 | 3.25 |
Level 3 | Equity | Market Comparable Approach | Minimum | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.13 | 0.68 |
Level 3 | Equity | Market Comparable Approach | Maximum | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 14.55 | 21.50 |
Level 3 | Equity | Market Comparable Approach | Maximum | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 5.75 | 2.00 |
Level 3 | Equity | Market Comparable Approach | Weighted Average | EBITDA Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 7.02 | 9.88 |
Level 3 | Equity | Market Comparable Approach | Weighted Average | Revenue Multiple |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 2.93 | 1.87 |
Level 3 | Equity | Options Pricing Model | Expected Volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Fair value | $ 5 | $ 981 |
Level 3 | Equity | Options Pricing Model | Minimum | Expected Volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.800 | 0.730 |
Level 3 | Equity | Options Pricing Model | Maximum | Expected Volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.900 | 0.842 |
Level 3 | Equity | Options Pricing Model | Weighted Average | Expected Volatility |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Measurement input | 0.873 | 0.730 |
[1] | Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5D -Subparagraph (SX 210.12-13D(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=SL120429264-123010 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column C)) -URI https://asc.fasb.org/extlink&oid=122147990&loc=d3e611197-123010 + Details
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